WO2015182760A1 - Shaped paper article, localized-region coating method, and coating device - Google Patents

Shaped paper article, localized-region coating method, and coating device Download PDF

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Publication number
WO2015182760A1
WO2015182760A1 PCT/JP2015/065631 JP2015065631W WO2015182760A1 WO 2015182760 A1 WO2015182760 A1 WO 2015182760A1 JP 2015065631 W JP2015065631 W JP 2015065631W WO 2015182760 A1 WO2015182760 A1 WO 2015182760A1
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WO
WIPO (PCT)
Prior art keywords
resin
powder
paper
coating
molded body
Prior art date
Application number
PCT/JP2015/065631
Other languages
French (fr)
Japanese (ja)
Inventor
國廣　一郎
Original Assignee
東洋製罐グループホールディングス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2014112617A external-priority patent/JP6409340B2/en
Priority claimed from JP2014112616A external-priority patent/JP6488560B2/en
Priority claimed from JP2014112615A external-priority patent/JP6488559B2/en
Application filed by 東洋製罐グループホールディングス株式会社 filed Critical 東洋製罐グループホールディングス株式会社
Priority to US15/314,578 priority Critical patent/US20170191151A1/en
Priority to KR1020187004758A priority patent/KR101894755B1/en
Priority to CN201580027343.XA priority patent/CN106414252B/en
Priority to EP15800664.3A priority patent/EP3150502A4/en
Priority to KR1020167033841A priority patent/KR101877275B1/en
Publication of WO2015182760A1 publication Critical patent/WO2015182760A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/28—Other details of walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/162—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed
    • B05B7/1626—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed at the moment of mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/08—Flame spraying
    • B05D1/10—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
    • B65D3/04—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially cylindrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
    • B65D3/06—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially conical or frusto-conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • B65D3/14—Discs fitting within container end and secured by bending, rolling, or folding operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3453—Rigid containers, e.g. trays, bottles, boxes, cups
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
    • G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
    • G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
    • G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
    • G01F11/24—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for fluent solid material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/22—Paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air

Definitions

  • the present invention relates to a paper molded body such as a cup-shaped paper molding container, and a local area coating method and coating apparatus suitable for coating a local area of the paper molded body with a coating material.
  • a typical cup-shaped paper molded body as a paper molded body for eating and drinking has a step due to bonding of both ends of the blank to the opening curl portion, and a bonding portion is also formed on the body portion. The paper edge is exposed inside and outside the cup.
  • a lid material is heat sealed on the upper surface of the curled portion.
  • the curled portion is usually flattened to form a flange to prevent the lid material from being thermally bonded to increase the adhesion area.
  • Such a cup-shaped paper molded body is used as a container for direct drinking, but if there is a step at the opening end, the mouth feels uncomfortable, and the flatly crushed flange itself feels uncomfortable against the mouth. .
  • the paper edge is exposed to the inside and outside of the molded body at the bonding position of the body portion, the paper edge located particularly inside is directly in contact with the content liquid and absorbs moisture, thereby deteriorating the water resistance of the container. There is a problem. Further, in the case of the squeezed paper molded product, wrinkles are generated in the flange portion at the periphery of the opening, and thus there is a problem that it is difficult to ensure the sealing performance when the lid material is sealed on the flange surface.
  • an edge extension piece composed of a thermoplastic resin layer laminated on a base material sheet is provided on both opposite edges of a conventional blank, Adhere both ends so that one edge extension piece is inside the paper molded body and the other edge extension piece is outside so that the paper parts of the sheet do not overlap.
  • a technique for pressure bonding see Patent Document 1.
  • the inner side edge portion is scraped so as to become thinner toward the end side, and the outer side edge portion is bonded to form a body bonding portion and a curl bonding portion.
  • the level difference of the bonded portion is reduced (see Patent Document 2).
  • a resin reinforcing ring formed separately in the opening is welded to eliminate a step in the curled portion of the opening so as to improve the sealing performance and mouth feel (See Patent Document 3).
  • Patent a method of forming a film by injecting molten resin, which is extruded and melted with a screw while heating a resin raw material in the same manner as an injection molding machine, onto a surface of an object such as metal is formed (Patent) Reference 6).
  • this device is suitable for resin coating on the surface of a large object, accurate intermittent injection of a small amount of resin is difficult. For example, a small amount of resin is placed on the stepped portion of an opening curl portion such as a paper cup.
  • the bonded end is formed by an edge extension piece made of a thermoplastic resin, or the paper edge is thinly pasted. It is difficult to make the alignment step small because the processing difficulty is high and unstable, and the manufacturing process is complicated, and it is difficult to increase the speed and efficiency of the manufacturing process. Also, fusing the opening-reinforced resin ring of another member to the paper molded body increases the material cost and requires a separate resin ring molding step and a welding step, resulting in problems such as high manufacturing costs. There is. Also, for paper compacts that are transported on a transport line and are industrially mass-produced, a resin film mainly composed of synthetic resin is partially intermittently accurately and efficiently in a narrow area of the paper compact. It can be said that the technology to form is not yet established.
  • the present invention can easily solve the above-mentioned problems in the paper molded body without going through a complicated process, and the above-mentioned problems caused by the sealing property of the paper molded body having an opening and the occurrence of bonded portions and wrinkles. And a local area resin coating method and apparatus capable of performing resin coating accurately and efficiently even in a narrow region of the paper molded body, and capable of intermittent and repeated resin coating. Objective.
  • the paper molded body of the present invention that solves the above-mentioned problems is characterized in that, in the paper molded body having an opening, the resin is deposited by thermal spraying of a coating material made of powder mainly composed of synthetic resin in a local portion. It is what.
  • the paper molded body of the present invention may be configured such that the local portion is at least a bonding stepped portion at the periphery of the opening of the cup-shaped paper molded body, and the stepped portion is filled with resin to fill the stepped portion. it can.
  • the said local part is the bonding level
  • it can comprise so that the paper edge of the said bonding part may be resin-coated with the resin pile to this level
  • the paper molding container is a drawn molded body mainly made of paper, it can be configured to cover the wrinkles of the opening flange surface by forming the resin pile all around the opening flange surface.
  • the said resin pile can also be comprised so that the film thickness of 0.3 mm or less formed by thermal spraying the heat-adhesive resin powder.
  • the paper molding container of the present invention is a microwave molding-compatible paper molding container
  • a resin coating layer containing a non-burning substance in a local region of the paper container, generation of scorching during microwave heating is prevented. can do.
  • the local region is an inner circumferential surface of an annular leg portion that is likely to be burned during microwave heating.
  • the resin coating layer can be effectively formed with a small amount of coating material at a predetermined position by thermal spraying a powder obtained by mixing a non-burning substance powder with a resin powder.
  • the type of the resin powder is not limited, but polyolefin resin powders such as polyethylene and polypropylene having a particle size of 30 to 300 ⁇ m and polyester resin powders such as PET, PEN, PLA, and PBT can be effectively employed.
  • polyester resin powders such as PET, PEN, PLA, and PBT
  • non-burning substance powder calcium carbonate and talc, which are inexpensive low dielectric constant substances, can be used.
  • the local region resin coating method of the present invention that solves the above problem is a coating method in which a local region of an object is coated with a coating material mainly composed of a synthetic resin, and the powder mainly composed of a synthetic resin is intermittently applied.
  • Thermal spraying is performed on the local region.
  • the powder can be repeatedly applied in a small amount to the target by cutting the powder into a fixed amount, pumping it with a pressurized gas, and joining the heated gas to intermittently spray the local region.
  • the powder is preferably heated by hot air near the melting point of the synthetic resin and partially melted.
  • the object is not heated in a completely melted state by preheating the local area to be coated, but the injected resin powder is completely melted on the surface of the object to cover the surface of the object. Therefore, there is no occurrence of the stringing phenomenon, the cycle of intermittent spraying can be increased, and the coating efficiency can be increased.
  • the local region resin coating apparatus of the present invention that solves the above problems is a coating apparatus that coats with a coating material mainly composed of synthetic resin, wherein the coating material is powder, and the powder is supplied.
  • the quantitative cut-out shutter device comprises a rotating body that traverses the outlet opening of the tank.
  • the rotating body is provided with a measuring chamber facing the outlet opening of the tank, and communicates with a gas supply port of the measuring chamber.
  • a valve for supplying pressurized gas to the metering chamber the rotating body being capable of intermittent rotation between the metering position and the spraying position, facing the outlet opening of the tank at the metering position; It is possible to adopt a configuration in which a fixed amount of powder is measured, the measuring chamber faces the spray nozzle at an injection position, and pressurized gas is supplied from the valve to the measuring chamber to press the powder to the spray nozzle.
  • the blank base material is specially processed to solve the problems caused by the bonded portion of the paper molded body having openings and the occurrence of wrinkles simply by applying a resin pile locally to the paper molded body. Therefore, it is possible to obtain a paper molded body that can be easily solved at low cost and has excellent sealing properties.
  • the present invention to a bonding step portion at the peripheral edge of the opening of the cup-shaped paper molded body, and adding a small amount of resin to the step portion, the mouthfeel when directly drinking the contents from the container is increased.
  • the sealing performance can be improved, and the applicability to a sealed container in which the contents of the paper molded body can be stored at room temperature can be improved. it can.
  • leakage from the step portion when the container is sealed with an overcap can be effectively prevented.
  • the present invention can be applied to an exposed paper edge such as a bonded portion of a paper molded body, and the exposed paper edge can be effectively resin-coated, and moisture absorption of content liquid or the like can be performed from the exposed paper edge. Water resistance can be improved.
  • the flange flange can be covered, and the heat-sealing property of the heat-sealing lid material can be enhanced and the sealing performance can be enhanced.
  • the resin pile With an average film thickness of 0.3 mm or less formed by spraying a thermal adhesive resin powder, there is no stringing and it can be efficiently formed with a small resin material.
  • the paper molding container of the present invention when the paper molding container of the present invention is compatible with microwave heating, it is easy to change the basic structure of the conventional paper molding container by forming a resin coating layer containing a non-burning substance in the local region. By such means, it is possible to easily prevent the occurrence of scorching during microwave heating. And in the case of a cup-shaped paper-molded container, it is easy to burn without changing the bottom shape of the conventional cup-shaped molded container by simply forming a resin coating layer containing a scorching preventing substance on the inner peripheral surface of the annular leg. Occurrence can be prevented. Furthermore, the resin coating layer can be formed reliably and inexpensively on the inner peripheral surface of the annular leg by spraying a powder obtained by mixing a non-burning powder with a plastic powder. By using an inorganic substance having a relative dielectric constant of 2 or less as the anti-burning substance powder, a non-burning layer can be formed effectively.
  • resin coating can be accurately and efficiently performed even in a small area by intermittently spraying a powder mainly composed of synthetic resin on a local region.
  • intermittently cutting and spraying a powder mainly composed of synthetic resin it becomes possible to spray a small particle size material with high welding efficiency to a small area, and it is efficient with the minimum amount of material used.
  • the resin can be well coated and high cycle can be achieved.
  • the synthetic resin powder is heated in the vicinity of its melting point with hot air and partially melted to melt after adhering to the object, so that the resin stringing phenomenon is eliminated and high-speed intermittent injection can be performed accurately.
  • the object is preheated in the local region to be coated with the resin, so that the resin powder sprayed in a state of being partially melted by heating near the melting point can be efficiently welded in the local region.
  • the coating method of the present invention can be applied to a bonding step portion of an opening curl portion of a container having an opening portion so that a small amount of resin can be deposited on the step portion, and the contents can be directly taken from the container.
  • leakage from the step portion when the container is sealed with an overcap can be effectively prevented.
  • the coating method of the present invention can be applied to the exposed paper edge such as the overlapping portion of the paper container so that the exposed paper edge can be effectively resin-coated, and moisture from the exposed paper edge can be absorbed. Water resistance can be improved. Further, the coating method of the present invention can be applied to a paper molded body having low rigidity to add local build-up as a reinforcing material, and the rigidity and shape retention of the molded body can be improved. . Further, by applying the coating method of the present invention, for example, by mixing a powder such as an inorganic substance in the powder resin, and applying it to a region where scorching is likely to occur when a paper container is heated in a microwave oven, It can be modified so that it does not easily burn.
  • the coating apparatus of the present invention has a simple structure and can be reduced in size, can be easily and inexpensively incorporated into a normal production line, and even if the sprayed area is a small area, a small amount of powder
  • the resin can be sprayed accurately and intermittently, and the material used can be reduced.
  • the coating apparatus of the present invention includes a quantitative cut-out shutter device, so that even a small amount of powder resin can be accurately measured with a simple mechanism and can be intermittently performed at high speed. .
  • thermal spraying can be performed without using a flame, and the thermal influence of the object and the coating resin itself can be mitigated.
  • FIG. 4 is a schematic diagram when the powder shown in FIG. 3 is compressed and filled into a measuring chamber. It is the photograph which put the resin on the lamination base paper of Example 1 of this invention. It is the photograph of the cross section of the level
  • FIG. 1 shows a cup-shaped container as a paper molded body according to an embodiment of the present invention.
  • the cup-shaped container 1 is formed by concatenating and bonding both end edges of a fan-shaped blank serving as the body portion 2 into a conical shape, curling the upper end portion thereof to form an open end portion, and forming a lower end B step.
  • the surface is folded inward to form a folded piece 52, and an annular leg portion 7 is formed by crimping an annular bent portion 58 of a bottom plate 57 drawn into a U-shaped cross section therebetween.
  • FIG. 1 shows a cup-shaped container as a paper molded body according to an embodiment of the present invention.
  • the cup-shaped container 1 is formed by concatenating and bonding both end edges of a fan-shaped blank serving as the body portion 2 into a conical shape, curling the upper end portion thereof to form an open end portion, and forming a lower end B step.
  • the surface is folded inward to form a folded piece
  • a stepped portion 4 is formed by pasting both ends of the blank. Further, a bonding portion 5 is formed on the body portion, and paper edges are exposed at both ends of the bonding portion on the inner side and the outer side of the cup.
  • the above structure is the same as that of a conventionally known cup-shaped paper molding container.
  • Such a paper molding container is a microwave heating container, and the body blank and the bottom member are mainly made of paper, but a polyolefin resin or a polyester resin is laminated to protect the inner and outer surfaces from liquid contents.
  • a composite paper material coated or impregnated, or a material composed of a composite layer having a gas barrier layer as an inner layer as required can be employed, and the material is not particularly limited as long as it can be heated in a microwave oven.
  • the coating layer 60 was formed so as to prevent the occurrence of scorching during microwave heating.
  • the resin coating layer is formed by spraying a powder obtained by mixing a synthetic resin powder having a particle size of 30 to 300 ⁇ m and a non-burning substance powder to form the resin coating layer 60 on the inner peripheral surface of the annular leg 7. .
  • the material which has easy-adhesion with respect to the paper molding container which has paper as a main component is used.
  • the base paper substrate is coated with a resin, and it is easy to use a resin of the same type as the surface resin layer or a resin having a lower melting point than the surface resin layer.
  • the synthetic resin is not particularly limited as long as it is a thermoplastic resin, but is a polyolefin such as high-medium-low density polyethylene and polypropylene, or one or more kinds of polyester resins such as PET, PEN, PLA and PBT. Powder can be used.
  • non-burning powder material for example, calcium carbonate, talc or the like can be adopted as a material having a low relative dielectric constant. As a result, heat generation due to absorption of microwaves in the annular leg portion is reduced, and the occurrence of scorching can be prevented.
  • the formation of the resin coating layer containing the non-burning substance in the local region may be performed by hot melt, hot runner, flame spraying, or the like.
  • the stringing phenomenon of the coating resin occurs in any of the above methods, and thus the cycle up is limited. It is difficult to apply accurately.
  • a pre-heating step and a resin spraying step are provided as post-processing steps on the cup-shaped container that is molded and transported in the production line, and hot air is applied to the resin application region in the pre-heating step.
  • the thermal spraying of the resin powder is performed by using a powder resin powder obtained by mixing a synthetic resin powder having a particle size of 30 to 300 ⁇ m and a non-burning substance powder as a raw material, and heating the raw material to a melting temperature of the resin or lower. It can be formed by thermally spraying the resin material intermittently or continuously on the inner peripheral surface of the annular leg portion with a heating gas (hot air in the present embodiment) by an injection nozzle.
  • a heating gas hot air in the present embodiment
  • FIG. 2 shows another embodiment of the present invention.
  • the flange surface 12 of the draw-molded container 10 has a resin pile 13 ( FIG. 2 shows a state where the resin is partway filled), and when the lid material is heat-sealed, the resin is fused to fill the flaws, and the lid material is completely fused to improve the sealing performance. I did it.
  • a powder mainly composed of a synthetic resin is quantified.
  • the heat was cut to near the melting point of the synthetic resin and intermittently sprayed repeatedly on the local area intermittently.
  • the synthetic resin powder the resin material and its particle size are selected according to the local application / purpose covered with the synthetic resin. For example, when spraying in the stepped area of the opening curl portion of the cup for resin deposition, heat sealing resin powder such as polyethylene is employed.
  • FIG. 3 schematically shows a main part of the resin coating apparatus 30 according to the present embodiment for spraying a powder resin to a local region, and is quantitatively cut out at a lower end opening 33 of a hopper-shaped tank 31.
  • a thermal spray nozzle 32 is provided via a shutter device 35.
  • a powder supply device 34 is connected to the tank 31 to supply powder mainly composed of resin to the tank 31.
  • a heating means for heating the supplied powder resin to a predetermined temperature can be provided as necessary.
  • the hot air generator 40 is preferable.
  • the fixed quantity cut-out shutter device 35 includes a rotating body 36 that traverses the lower end opening 33 of the tank 31, faces the lower end opening 33 of the tank 31 to the rotating body 36, and the top reaches the substantially central axis of the rotating body 36.
  • a conical depression measuring chamber 37 is provided.
  • One end of the rotator 36 is connected to intermittent rotation driving means (not shown), and has a channel 42 having one end connected to a pressurized gas source along the central axis, and the channel is a measuring chamber. It communicates with a pressurized gas supply port 38 formed at the top of 37.
  • a supply pipe 43 connected to a compressed air supply source such as a compressor is connected to the flow path 42, and the supply timing of the pressurized gas into the measuring chamber 37 is controlled by an electromagnetic valve 44 provided in the supply pipe. Control.
  • the rotating body 36 is intermittently half-rotated and controlled so that the measuring chamber is alternately positioned at the powder measuring position and the pressure feeding position to the spray nozzle.
  • a heating gas is supplied to the thermal spray nozzle 32 as a heating means.
  • the heated gas is preferably hot air, and the hot air is supplied to the thermal spray nozzle as a heated gas heated to a predetermined temperature by heating means such as electric or gas combustion by a hot air generator 40 connected to an air supply source such as a compressor.
  • the thermal spray nozzle 32 has an introduction flow channel 45 for receiving the powder resin from the measuring chamber 37 when the rotating body 36 is rotated to the thermal spray position, and an injection flow channel 46 having a predetermined diameter is formed below the thermal spray nozzle 32. ing. A heating gas is supplied to the injection flow path 46, and the heating gas merges with the powder pressure-fed from the measurement chamber.
  • the rotary body 36 is rotatably connected in a sealed state between the tank 31, the quantitative cutout shutter device 35 and the thermal spray nozzle 32 so that the powder does not leak outside.
  • the powder resin coating apparatus of the present invention is configured as described above, and performs resin coating by spraying the powder resin onto a predetermined region of the object as follows.
  • region of a target object is preheated.
  • the preheating is not particularly limited, and various heating methods can be adopted. However, in order to heat with partially simple and inexpensive equipment, hot air is supplied from the preheating nozzle 25 as shown in FIG. It is preferable to spray. Moreover, preheating can also be performed by using hot air from a thermal spray nozzle and delaying resin injection. By preheating the surface to be sprayed, even if the resin sprayed from the spray nozzle is not completely melted, the resin is well welded to the surface of the object, and a resin coating can be intermittently formed at a high speed.
  • the resin coating is performed by spraying a powder resin onto the local area of the preheated object with the above coating apparatus.
  • the powder resin is supplied into the tank 31 in the state shown in FIG. 3A.
  • the powder resin is automatically filled.
  • the measuring chamber 37 is reversed as shown in FIG. 3B to face the introduction flow path 45 of the thermal spray nozzle 32, and at the same time, the valve 44 is opened and pressurized air is opened. Is injected into the measuring chamber through the pressurized gas supply port 38, and a certain amount of the resin powder in the measuring chamber joins with the heated gas flowing through the spray passage 46 of the spray nozzle and is sprayed onto the local region of the object.
  • the powder provided in the tank as shown in FIG. 4B so that the resin is completely filled in the measuring chamber 37.
  • the nozzle 34-1 of the body resin supply device 34 is extended to the immediate upper part of the measuring chamber so as to compress and fill the powder.
  • Example 1 (Resin pile on laminated base paper) As shown in FIG. 5, powder resin was sprayed on the front side of the prototype laminated base paper 70 ([front] polyethylene 18 ⁇ m / base paper (300 g / m 2 ) / [back] polyethylene 18 ⁇ m) under the following conditions using the above apparatus.
  • Powder resin Low-density polyethylene powder having an average particle size of 120 ⁇ m
  • Single powder injection amount about 20 mg
  • Distance between thermal spray nozzle and target surface 6mm
  • Nozzle outlet hot air temperature 320 ° C
  • Preheating Delay before injection 1.5s
  • a resin pile 71 having a central coating thickness of 1.1 mm as shown in FIG. 5 could be satisfactorily formed without causing a stringing phenomenon.
  • Example 2 (resin pile on a step part) Resin was sprayed in the vicinity of the stepped portion 4 of the opening curled portion 3 of the cup-shaped container 1 by the above apparatus under the following conditions.
  • Powder resin Low-density polyethylene powder having an average particle size of 120 ⁇ m
  • Single powder injection amount about 25 mg
  • Distance between spray nozzle and spray target surface 10mm
  • Nozzle outlet hot air temperature 320 ° C
  • Preheating Delay before injection 1.5s
  • Remarks Reheating with hot air generator
  • a resin pile 8 having a coating thickness of 0.3 mm can be satisfactorily formed so as to cover the stepped portion 4. It was.
  • the resin melts when the lid material is heat-sealed, so that the weldability with the lid material is further increased without crushing the curled portion, and the sealing performance is improved. And I was able to eliminate the uncomfortable feeling when drinking directly. Also, in the case of an overcap, the stepped portion of the curled portion is eliminated, so that leakage from the curled portion can be prevented.
  • Example 3 (Resin coating for the purpose of local modification of an object) Resin coating was performed on the inner peripheral surface of the annular leg portion of the cup-shaped container over the entire circumference under the following conditions.
  • Test container cup-shaped container (material: same for trunk and bottom) Material layer structure: Body: (Inner) Polyethylene (20 ⁇ m) // Slash slash paper (250g / m 2 ) Bottom: (inside) polyethylene (40 ⁇ m) // paper 250 g / m 2 // polyethylene (15 ⁇ m) Full capacity: 565 ml, annular leg height: 10 mm
  • Anti-burning substance (low dielectric constant material): Calcium carbonate Resin coating film: Width of about 10 mm along the inner circumference of the annular leg portion, film thickness of 1 mm or less A resin coating layer containing an anti-burning substance was formed on the inner circumferential surface of the annular leg.
  • the cup-shaped container which necessarily has an annular leg part.
  • the present invention is not limited to this, and the present invention can be applied to a variety of structures having a portion that is likely to cause scoring of a microwave-compatible paper-molded container.
  • the present invention can reliably and efficiently deposit a resin in a narrow local area in a paper molding container, and can solve the problems of the sealing property of the paper molding container and the occurrence of scorching for a microwave oven, and is inexpensive. With a simple structure, the applicability of the paper-molded container to normal temperature distribution can be increased, and the coating resin can be reliably sprayed on the local region, and the industrial applicability is high.

Abstract

A raised resin part (8, 9) is formed in a localized area such as an overlapping bonded section of a cup-shaped paper article (1) via thermal spraying of a powdered resin, improving the sealing performance of the shaped paper article and forming, in a localized region that is prone to scorching when heated in a microwave oven, a resin coating (60) that contains a scorching-preventing substance. To form the raised resin part in said localized region, a shutter device is used to intermittently output the powdered resin from a tank and a pressurized gas is used to thermally spray the localized region repeatedly.

Description

紙成形体、及び局所領域被覆方法と被覆装置Paper molded body, local area coating method and coating apparatus
　本発明は、コップ状紙成形容器等の紙成形体、及び該紙成形体の局所領域を被覆材料で被覆するのに適する局所領域被覆方法及び被覆装置に関する。 The present invention relates to a paper molded body such as a cup-shaped paper molding container, and a local area coating method and coating apparatus suitable for coating a local area of the paper molded body with a coating material.
　飲食用の紙成形体として代表的なコップ状紙成形体は、開口カール部にブランク両端縁の貼り合わせによる段差があり、胴部にも貼り合わせ部ができ、該貼り合わせ部の両端縁は紙端がコップ内側及び外側で露出している。
　このようなコップ状紙成形体に内容物を充填し密封する場合、カール部の上面に蓋材をヒートシールしている。また、店頭販売等で充填して直ぐ消費される場合は、オーバーキャップを嵌着係合させて販売されている。蓋材をヒートシールする際は、蓋材の熱接着不良を防止するために通常カール部を平坦に潰してフランジ状にして接着面積の増大を図っている。このようなコップ状紙成形体は、直飲み用容器として使用されているが、開口端部に段差部があると口当たりに違和感があり、その上平坦に潰したフランジそのものが口に当たり違和感がある。また、胴部の貼り合せ位置では紙端縁が成形体の内外に露出するので、特に内側に位置する紙端縁は直接内容液と接触して吸湿してしまい、容器の耐水性を劣化させるという問題点がある。また、絞り紙成形体の場合、開口周縁のフランジ部にしわが発生するため、該フランジ面に蓋材をシールした場合に密封性を確保するのが困難であるという問題点がある。 A typical cup-shaped paper molded body as a paper molded body for eating and drinking has a step due to bonding of both ends of the blank to the opening curl portion, and a bonding portion is also formed on the body portion. The paper edge is exposed inside and outside the cup.
When the cup-shaped paper molded body is filled with the contents and sealed, a lid material is heat sealed on the upper surface of the curled portion. In addition, when the product is consumed immediately after being filled in a store or the like, it is sold with an overcap fitted. When heat-sealing the lid material, the curled portion is usually flattened to form a flange to prevent the lid material from being thermally bonded to increase the adhesion area. Such a cup-shaped paper molded body is used as a container for direct drinking, but if there is a step at the opening end, the mouth feels uncomfortable, and the flatly crushed flange itself feels uncomfortable against the mouth. . In addition, since the paper edge is exposed to the inside and outside of the molded body at the bonding position of the body portion, the paper edge located particularly inside is directly in contact with the content liquid and absorbs moisture, thereby deteriorating the water resistance of the container. There is a problem. Further, in the case of the squeezed paper molded product, wrinkles are generated in the flange portion at the periphery of the opening, and thus there is a problem that it is difficult to ensure the sealing performance when the lid material is sealed on the flange surface.
　ブランクを貼り合わせ成形した紙成形体の上記問題点を解決する方法として、従来ブランクの対向する両端縁に基材シート上に積層された熱可塑性樹脂層からなる端縁延長片を設け、基材シートの紙部分が重ならないように、一方の端縁延長片が紙成形体の内側に、他方の端縁延長片が外側にくるように両端部を貼り合わせ、各々端縁延長片同士を熱圧着するようにするものが提案されている（特許文献１参照）。また、他の方法として、内側となる側縁部を端辺に行くにしたがって薄くなるように削り取り、外側となる側縁部を貼り合わせて胴部貼り合わせ部及びカール貼り合わせ部を形成することによって、貼り合わせ部の段差を小さくするようにしたものが提案されている（特許文献２参照）。さらに他の手段として、開口部に別途成形した樹脂製補強リングを溶着することにより、開口部のカール部における段差をなくして密封性及び口当たり性を良くするようにしたものも提案されている（特許文献３参照）。 As a method for solving the above-mentioned problems of the paper molded body in which a blank is bonded and formed, an edge extension piece composed of a thermoplastic resin layer laminated on a base material sheet is provided on both opposite edges of a conventional blank, Adhere both ends so that one edge extension piece is inside the paper molded body and the other edge extension piece is outside so that the paper parts of the sheet do not overlap. There has been proposed a technique for pressure bonding (see Patent Document 1). Also, as another method, the inner side edge portion is scraped so as to become thinner toward the end side, and the outer side edge portion is bonded to form a body bonding portion and a curl bonding portion. Has been proposed in which the level difference of the bonded portion is reduced (see Patent Document 2). As another means, a resin reinforcing ring formed separately in the opening is welded to eliminate a step in the curled portion of the opening so as to improve the sealing performance and mouth feel ( (See Patent Document 3).
　一方、近年環境負荷の観点から循環型資源としての紙材を主体とする紙成形容器が注目され、密封性を高めてスープや飲料或いは固形物等の内容物を保存でき、且つ電子レンジで加熱できる電子レンジ対応の紙成形容器が求められている。しかしながら、ブランクの貼り合わせ部を有する紙成形容器を電子レンジで加熱する場合、貼り合わせ部にマイクロ波が集中しやすく、その部位では焦げが発生しやすい現象が生じる。特に、環状脚部を有するコップ状の紙成形容器の場合、環状脚部内周面に焦げが発生しやすいという問題がある。 On the other hand, in recent years, from the viewpoint of environmental load, paper-molded containers mainly made of paper as a recycling-type resource have attracted attention. There is a need for a paper-molded container that is compatible with microwave ovens. However, when a paper molding container having a blank bonding portion is heated in a microwave oven, microwaves tend to concentrate on the bonding portion, and a phenomenon in which scorching is likely to occur at that portion occurs. In particular, in the case of a cup-shaped paper molding container having an annular leg portion, there is a problem that the inner peripheral surface of the annular leg portion is likely to be burnt.
　そのため、従来電子レンジ加熱時における焦げ発生を防止するように工夫した紙製容器が提案されている（例えば、特許文献４－５参照）。しかしこれらは、何れも従来のコップ状紙容器の底部形状を変更するものであり、構造も複雑で従来の製造ラインに代わる新たな製造設備を必要とし、コスト高になる問題点があった。 Therefore, a paper container devised so as to prevent the occurrence of scorching during heating in a microwave oven has been proposed (see, for example, Patent Documents 4-5). However, these all change the shape of the bottom of the conventional cup-shaped paper container, have a complicated structure, require new manufacturing equipment to replace the conventional manufacturing line, and increase the cost.
　一方、従来紙成形容器等の対象物の局所を樹脂被覆する手段として、溶融樹脂をホットメルトガンやホットライナーで吐出して被覆する方法が一般的に行われているが、ノズルから吐出後に樹脂の糸引き現象が生じるため、狭領域への正確な被覆が困難であり、かつ樹脂の無駄が生じると共にサイクルアップが難しいという問題点がある。また、樹脂溶液コートやエマルジョンコート等の湿式方法もあるが、材料が限定的であり、かつ塗布後に溶剤を気化させなければならず溶剤の環境負荷も高いなどの問題点がある。さらに、射出成形機と同様に樹脂原料を加熱しながらスクリューで押し出して溶融化した溶融樹脂を、金属等の対象物表面に微粒子状に噴射して被膜を形成する方法も提案されている（特許文献６参照）。この装置は、大型対象物の表面への樹脂被覆には適していても、微量の樹脂の正確な間欠噴射は困難であり、例えば紙コップ等の開口カール部の段差部に少量の樹脂盛りをするのには適用困難であり、かつ装置の小型化・高速化が困難であると共に、設備コストも高い等の問題点がある。
　また、他の方法として、溶射ガンにより接着性樹脂粉末を対象物表面にアセチレン、プロパン等による火炎を利用するフレーム溶射で樹脂被覆することも知られている(特許文献７参照)。しかし、この場合も間欠処理やスプレーパターン制御が困難であり、狭領域への確実な溶射被覆は困難であり、且つ対象物や被覆樹脂自体が火炎により熱劣化を起こす恐れがある。 On the other hand, as a means for resin-coating the local area of an object such as a paper-molded container, a method of coating a molten resin by discharging it with a hot melt gun or a hot liner is generally performed. Therefore, there is a problem in that it is difficult to accurately cover a narrow region, resin is wasted, and it is difficult to cycle up. In addition, there are wet methods such as resin solution coating and emulsion coating, but there are problems that the material is limited and the solvent has to be vaporized after coating, and the environmental load of the solvent is high. Furthermore, a method of forming a film by injecting molten resin, which is extruded and melted with a screw while heating a resin raw material in the same manner as an injection molding machine, onto a surface of an object such as metal is formed (Patent) Reference 6). Although this device is suitable for resin coating on the surface of a large object, accurate intermittent injection of a small amount of resin is difficult. For example, a small amount of resin is placed on the stepped portion of an opening curl portion such as a paper cup. However, it is difficult to apply, and it is difficult to reduce the size and speed of the apparatus, and the equipment cost is high.
In addition, as another method, it is also known that an adhesive resin powder is coated on the surface of an object by flame spraying using a flame of acetylene, propane or the like with a spray gun (see Patent Document 7). However, in this case as well, intermittent processing and spray pattern control are difficult, and reliable spray coating in a narrow region is difficult, and there is a possibility that the target object or the coating resin itself may be thermally deteriorated by a flame.
　以上のように、従来、搬送ライン上を搬送されて工業的に大量生産される製品に対して、樹脂被膜を狭い領域に部分的に間欠的に正確かつ効率的に形成する技術は未だ確立されていないといえる。 As described above, a technique for forming a resin film partially and intermittently accurately and efficiently in a narrow area has been established for products that are conveyed on a conveying line and industrially mass-produced. It can be said that it is not.
特開２００５－１４９７５号公報JP 2005-14975 A 特開２００３－１９１９４１号公報JP 2003-191941 A 特開２００２－２６４９１８号公報JP 2002-264918 A 特開２００３－９５３５２号公報JP 2003-95352 A 特開２００５－８８９５５号公報JP 2005-88955 A 特開平０９－２０１８３３号公報JP 09-201833 A 特開昭６３－１４１６６６号公報JP-A-63-141666
　従来の紙成形体において、前記特許文献１、２に記載されているように、貼り合わせ端部を熱可塑性樹脂からなる端縁延長片で形成すること、或いは紙端縁を薄く加工して貼り合わせ段差を小さくするようにすることは、加工難易度が高く不安定であり、かつ製造工程が複雑になるという問題点があり、製造工程の高速化、効率化が難しい。また、別部材の開口部補強樹脂リングを紙成形体に融着することは、材料コストが高くなると共に別途樹脂リング成形工程及び溶着工程が必要となるため、製造コスト高になる等の問題点がある。
　また、搬送ライン上を搬送されて工業的に大量生産される紙成形体に対して、合成樹脂を主体とした樹脂被膜を紙成形体の狭い領域に部分的に間欠的に正確かつ効率的に形成する技術は未だ確立されていないといえる。 In a conventional paper molded body, as described in Patent Documents 1 and 2, the bonded end is formed by an edge extension piece made of a thermoplastic resin, or the paper edge is thinly pasted. It is difficult to make the alignment step small because the processing difficulty is high and unstable, and the manufacturing process is complicated, and it is difficult to increase the speed and efficiency of the manufacturing process. Also, fusing the opening-reinforced resin ring of another member to the paper molded body increases the material cost and requires a separate resin ring molding step and a welding step, resulting in problems such as high manufacturing costs. There is.
Also, for paper compacts that are transported on a transport line and are industrially mass-produced, a resin film mainly composed of synthetic resin is partially intermittently accurately and efficiently in a narrow area of the paper compact. It can be said that the technology to form is not yet established.
　そこで、本発明は、紙成形体における上記問題点を複雑な工程を経ずに簡易に解決でき、開口部を有する紙成形体の密封性及び貼り合わせ部や皺の発生に起因する上記問題点を解消した紙成形体、及び該紙成形体の狭い領域であっても正確に効率よく樹脂被覆ができ、且つ間欠的に繰り返し樹脂被覆ができる局所領域樹脂被覆方法及びその装置を提供することを目的とする。 Therefore, the present invention can easily solve the above-mentioned problems in the paper molded body without going through a complicated process, and the above-mentioned problems caused by the sealing property of the paper molded body having an opening and the occurrence of bonded portions and wrinkles. And a local area resin coating method and apparatus capable of performing resin coating accurately and efficiently even in a narrow region of the paper molded body, and capable of intermittent and repeated resin coating. Objective.
　上記問題点を解決する本発明の紙成形体は、開口部を有する紙成形体において、局所部に合成樹脂を主体とする粉体からなる被覆材料の溶射による樹脂盛りがなされていることを特徴とするものである。
　本発明の紙成形体は、前記局所部がコップ状紙成形体の開口部周縁のすくなくとも貼り合わせ段差部であり、該段差部へ樹脂盛りがなされて該段差部を埋めるように構成することができる。
　また、前記局所部が紙成形体の胴部の貼り合わせ段差部である場合、該段差部への樹脂盛りによって、前記貼り合わせ部の紙端縁を樹脂被覆するように構成することができる。
　さらに、前記紙成形容器が紙を主体とする絞り成形体である場合、開口フランジ面全周に前記樹脂盛りを形成することによって、該開口フランジ面のしわを被覆するように構成することができる。
　また、前記樹脂盛りは、熱接着性樹脂粉末を溶射して形成された被膜厚さ０．３ｍｍ以下であるように構成することもできる。 The paper molded body of the present invention that solves the above-mentioned problems is characterized in that, in the paper molded body having an opening, the resin is deposited by thermal spraying of a coating material made of powder mainly composed of synthetic resin in a local portion. It is what.
The paper molded body of the present invention may be configured such that the local portion is at least a bonding stepped portion at the periphery of the opening of the cup-shaped paper molded body, and the stepped portion is filled with resin to fill the stepped portion. it can.
Moreover, when the said local part is the bonding level | step difference part of the trunk | drum of a paper molded object, it can comprise so that the paper edge of the said bonding part may be resin-coated with the resin pile to this level | step-difference part.
Further, when the paper molding container is a drawn molded body mainly made of paper, it can be configured to cover the wrinkles of the opening flange surface by forming the resin pile all around the opening flange surface. .
Moreover, the said resin pile can also be comprised so that the film thickness of 0.3 mm or less formed by thermal spraying the heat-adhesive resin powder.
　本発明の紙成形容器が、電子レンジ加熱対応の紙成形容器の場合、該紙容器の局所領域に焦げ防止物質を含有する樹脂被覆層を形成することによって、マイクロ波加熱時のこげ発生を防止することができる。
　前記局所領域は、コップ状紙成形容器の場合、電子レンジ加熱時に焦げが発生しやすい環状脚部内周面とする。
　前記樹脂被覆層は、樹脂粉末に焦げ防止物質粉末を混合した粉体を溶射して形成することによって、所定位置に少ない被覆材料で効果的に被覆層を形成できる。
　前記樹脂粉末は、その種類は限定されないが、粒径３０～３００μｍのポリエチレンやポリプロピレン等のポリオレフィン樹脂粉末やＰＥＴ、ＰＥＮ、ＰＬＡ、ＰＢＴ等のポリエステル樹脂粉末が効果的に採用できる。
　一方、焦げ防止物質粉末としては、安価な低誘電率物質である炭酸カルシウムやタルクが採用できる。 In the case where the paper molding container of the present invention is a microwave molding-compatible paper molding container, by forming a resin coating layer containing a non-burning substance in a local region of the paper container, generation of scorching during microwave heating is prevented. can do.
In the case of a cup-shaped paper molding container, the local region is an inner circumferential surface of an annular leg portion that is likely to be burned during microwave heating.
The resin coating layer can be effectively formed with a small amount of coating material at a predetermined position by thermal spraying a powder obtained by mixing a non-burning substance powder with a resin powder.
The type of the resin powder is not limited, but polyolefin resin powders such as polyethylene and polypropylene having a particle size of 30 to 300 μm and polyester resin powders such as PET, PEN, PLA, and PBT can be effectively employed.
On the other hand, as the non-burning substance powder, calcium carbonate and talc, which are inexpensive low dielectric constant substances, can be used.
　上記課題を解決する本発明の局所領域樹脂被覆方法は、対象物の局所領域を合成樹脂を主体とする被覆材料で被覆する被覆方法であって、合成樹脂を主体とした粉体を間欠的に前記局所領域に溶射することを特徴とするものである。
　前記溶射は、前記粉体を定量に切り出し加圧ガスにより圧送し加熱ガスに合流させて間欠的に前記局所領域に溶射することによって、対象物に少量ずつ定量の樹脂被覆を繰り返し行うことができる。
　前記粉体の加熱は熱風により前記合成樹脂の融点近傍で加熱し部分的に溶融させることが望ましい。さらに、前記対象物は、被覆する局所領域を予備加熱することによって、完全に溶融した状態での噴射でなく、噴射された樹脂粉末は対象物の表面で完全に溶融して対象物表面を被覆するので、糸引き現象の発生がなく間欠溶射のサイクルアップが可能であり被覆効率を高めることができる。 The local region resin coating method of the present invention that solves the above problem is a coating method in which a local region of an object is coated with a coating material mainly composed of a synthetic resin, and the powder mainly composed of a synthetic resin is intermittently applied. Thermal spraying is performed on the local region.
In the thermal spraying, the powder can be repeatedly applied in a small amount to the target by cutting the powder into a fixed amount, pumping it with a pressurized gas, and joining the heated gas to intermittently spray the local region. .
The powder is preferably heated by hot air near the melting point of the synthetic resin and partially melted. Furthermore, the object is not heated in a completely melted state by preheating the local area to be coated, but the injected resin powder is completely melted on the surface of the object to cover the surface of the object. Therefore, there is no occurrence of the stringing phenomenon, the cycle of intermittent spraying can be increased, and the coating efficiency can be increased.
　さらに、上記課題を解決する本発明の局所領域樹脂被覆装置は、合成樹脂を主体とする被覆材料で被覆する被覆装置であって、前記被覆材料が粉体であり、該粉体が供給されるタンク、該タンクの下端と連通した溶射ノズル、前記タンクの下端開口部と前記溶射ノズルとの間に設けられた定量切り出しシャッター装置とを備えてなり、前記タンクから定量の粉体を前記定量切り出しシャッター装置で切り出して加熱ガスに合流させ、前記溶射ノズルから溶射するようにしてなることを特徴とするものである。 Furthermore, the local region resin coating apparatus of the present invention that solves the above problems is a coating apparatus that coats with a coating material mainly composed of synthetic resin, wherein the coating material is powder, and the powder is supplied. A tank, a thermal spray nozzle communicating with the lower end of the tank, and a quantitative cutout shutter device provided between the lower end opening of the tank and the thermal spray nozzle, and the quantitative cutout of powder from the tank It is cut out by a shutter device, merged with a heated gas, and sprayed from the spray nozzle.
　前記定量切り出しシャッター装置は、前記タンクの出口開口部を横切る回転体からなり、該回転体に前記タンクの出口開口部に面する計量室が設けられると共に、該計量室のガス供給口に連通し該計量室に加圧ガスを供給するバルブを有してなり、前記回転体は、計量位置と溶射位置との間を間欠回転可能であり、計量位置で前記タンクの出口開口部に面して定量の粉体を計量し、噴射位置で前記計量室が前記溶射ノズルに面し、前記バルブから前記計量室に加圧ガスが供給されて前記粉体を前記溶射ノズルに圧送する構成が採用できる。 The quantitative cut-out shutter device comprises a rotating body that traverses the outlet opening of the tank. The rotating body is provided with a measuring chamber facing the outlet opening of the tank, and communicates with a gas supply port of the measuring chamber. A valve for supplying pressurized gas to the metering chamber, the rotating body being capable of intermittent rotation between the metering position and the spraying position, facing the outlet opening of the tank at the metering position; It is possible to adopt a configuration in which a fixed amount of powder is measured, the measuring chamber faces the spray nozzle at an injection position, and pressurized gas is supplied from the valve to the measuring chamber to press the powder to the spray nozzle. .
　本発明によれば、単に紙成形体の局所に樹脂盛りを施すことにより、開口部を有する紙成形体の貼り合わせ部や皺の発生に起因する問題点をブランク基材に特別な加工を施すことなく容易にかつ安価なコストで解決でき、密封性に優れた紙成形体を得ることができる。
　また、本発明をコップ状紙成形体の開口周縁部の貼り合わせ段差部に適用して、該段差部に少量の樹脂盛りをすることによって、該容器から内容物を直飲みする場合の口当たりを良くすると共に、蓋材をヒートシールする際の該段差部でのシール性が向上し密封性を高めることができ、紙成形体を内容物が常温保存できる密封容器への適用性を高めることができる。また該容器にオーバーキャップを被せて密封する際の、前記段差部からの漏洩を効果的に防ぐことができる。
　さらに、本発明を紙成形体の貼り合わせ部等の露出する紙端縁に適用して、該露出紙端縁を効果的に樹脂被覆することができ、露出紙端縁から内容液等の吸湿を防止して耐水性を高めることができる。
　さらに、また本発明を紙を主体とする絞り成形体の開口フランジ面に適用することによって、フランジの皺を被覆できて、ヒートシール蓋材の熱溶着性を高め密封性を高めることができる。
　前記樹脂盛りを、熱接着性樹脂の粉末を溶射して形成した平均被膜厚さ０．３ｍｍ以下に構成することによって、糸引きが無く、少ない樹脂材料で効率的に形成できる。 According to the present invention, the blank base material is specially processed to solve the problems caused by the bonded portion of the paper molded body having openings and the occurrence of wrinkles simply by applying a resin pile locally to the paper molded body. Therefore, it is possible to obtain a paper molded body that can be easily solved at low cost and has excellent sealing properties.
In addition, by applying the present invention to a bonding step portion at the peripheral edge of the opening of the cup-shaped paper molded body, and adding a small amount of resin to the step portion, the mouthfeel when directly drinking the contents from the container is increased. As well as improving the sealing performance at the stepped portion when heat-sealing the lid material, the sealing performance can be improved, and the applicability to a sealed container in which the contents of the paper molded body can be stored at room temperature can be improved. it can. In addition, leakage from the step portion when the container is sealed with an overcap can be effectively prevented.
Furthermore, the present invention can be applied to an exposed paper edge such as a bonded portion of a paper molded body, and the exposed paper edge can be effectively resin-coated, and moisture absorption of content liquid or the like can be performed from the exposed paper edge. Water resistance can be improved.
Furthermore, by applying the present invention to the opening flange surface of the drawn molded body mainly composed of paper, the flange flange can be covered, and the heat-sealing property of the heat-sealing lid material can be enhanced and the sealing performance can be enhanced.
By forming the resin pile with an average film thickness of 0.3 mm or less formed by spraying a thermal adhesive resin powder, there is no stringing and it can be efficiently formed with a small resin material.
　また、本発明の紙成形容器が電子レンジ加熱対応の場合、その局所領域に焦げ防止物質を含有する樹脂被覆層を形成することによって、従来の紙成形容器の基本的構造を変更することなく簡易な手段により容易にマイクロ波加熱時の焦げの発生を防止できる。
　そして、コップ状紙成形容器の場合、環状脚部内周面に焦げ防止物質を含有する樹脂被覆層を形成するのみで、従来のコップ状成形容器の底部形状を変更することなく、容易に焦げの発生を防止できる。
　さらに、前記樹脂被覆層は、プラスチック粉末に焦げ防止粉末を混合した粉体を溶射して形成することによって、環状脚部内周面に確実に且つ安価に焦げ防止層を形成することができる。前記焦げ防止物質粉末として比誘電率２以下の無機物を採用することによって、効果的に焦げ防止層を形成することができる。 In addition, when the paper molding container of the present invention is compatible with microwave heating, it is easy to change the basic structure of the conventional paper molding container by forming a resin coating layer containing a non-burning substance in the local region. By such means, it is possible to easily prevent the occurrence of scorching during microwave heating.
And in the case of a cup-shaped paper-molded container, it is easy to burn without changing the bottom shape of the conventional cup-shaped molded container by simply forming a resin coating layer containing a scorching preventing substance on the inner peripheral surface of the annular leg. Occurrence can be prevented.
Furthermore, the resin coating layer can be formed reliably and inexpensively on the inner peripheral surface of the annular leg by spraying a powder obtained by mixing a non-burning powder with a plastic powder. By using an inorganic substance having a relative dielectric constant of 2 or less as the anti-burning substance powder, a non-burning layer can be formed effectively.
　本発明の被覆方法によれば、合成樹脂を主体とする粉体を間欠的に局所領域に溶射することにより、小さい面積であっても正確に効率よく樹脂被覆ができる。
　そして、合成樹脂を主体とする粉体を定量に間欠的に切り出して溶射することにより、溶着効率の高い粒径の小さい材料を小面積に溶射することが可能となり、最小限の使用材料で効率良く樹脂被覆でき、かつハイサイクル化が可能である。
　さらに、溶射は熱風で合成樹脂紛体をその融点近傍で加熱し部分的に溶融させることによって、対象物に付着後に溶融するので樹脂の糸引き現象がなくなり、高速の間欠噴射が正確にできる。
　そして、対象物は樹脂被覆する局所領域を予備加熱することにより、融点近傍で加熱し部分的に溶融させた状態で溶射された樹脂紛体が局所領域で効率的に溶着することができる。
　また、本発明の被覆方法を、開口部を有する容器の開口カール部の貼り合せ段差部に適用して、該段差部に少量の樹脂盛りをすることができ、該容器から内容物を直飲みする場合の口当たりを良くすることができると共に、蓋材をヒートシールする際の該段差部でのシール性を高めることができる。また該容器にオーバーキャップを被せて密封する際の、前記段差部からの漏洩を効果的に防ぐことができる。
　さらに、本発明の被覆方法を、紙製容器の重ね合せ部等の露出紙端に適用して、該露出紙端を効果的に樹脂被覆することができ、露出紙端から内容液等の吸湿を防止して耐水性を高めることができる。
　また、本発明の被覆方法を、剛性の低い紙成形体に適用して、補強材としての局所的な肉盛りを追加することができ、成形体の剛性や保形性を向上することができる。
　さらに、本発明の被覆方法を、例えば該粉体樹脂に無機物等の粉末を混合して、紙製容器を電子レンジで加熱する場合に焦げが発生しやすい局所に適用することによって、該局所を焦げが発生しにくいように改質することができる。 According to the coating method of the present invention, resin coating can be accurately and efficiently performed even in a small area by intermittently spraying a powder mainly composed of synthetic resin on a local region.
In addition, by intermittently cutting and spraying a powder mainly composed of synthetic resin, it becomes possible to spray a small particle size material with high welding efficiency to a small area, and it is efficient with the minimum amount of material used. The resin can be well coated and high cycle can be achieved.
Further, in the thermal spraying, the synthetic resin powder is heated in the vicinity of its melting point with hot air and partially melted to melt after adhering to the object, so that the resin stringing phenomenon is eliminated and high-speed intermittent injection can be performed accurately.
The object is preheated in the local region to be coated with the resin, so that the resin powder sprayed in a state of being partially melted by heating near the melting point can be efficiently welded in the local region.
In addition, the coating method of the present invention can be applied to a bonding step portion of an opening curl portion of a container having an opening portion so that a small amount of resin can be deposited on the step portion, and the contents can be directly taken from the container. In addition, it is possible to improve the mouth-feel and to improve the sealing performance at the stepped portion when the lid material is heat-sealed. In addition, leakage from the step portion when the container is sealed with an overcap can be effectively prevented.
Furthermore, the coating method of the present invention can be applied to the exposed paper edge such as the overlapping portion of the paper container so that the exposed paper edge can be effectively resin-coated, and moisture from the exposed paper edge can be absorbed. Water resistance can be improved.
Further, the coating method of the present invention can be applied to a paper molded body having low rigidity to add local build-up as a reinforcing material, and the rigidity and shape retention of the molded body can be improved. .
Further, by applying the coating method of the present invention, for example, by mixing a powder such as an inorganic substance in the powder resin, and applying it to a region where scorching is likely to occur when a paper container is heated in a microwave oven, It can be modified so that it does not easily burn.
　本発明の被覆装置は、構成が簡単でかつ小型化が可能であり、通常の生産ラインに容易にかつ安価に組み込むことが可能であり、しかも溶射領域が小面積であっても、少量の紛体樹脂を正確に間欠的に溶射することができ、使用材料を低減させることができる。
　また、本発明の被覆装置は、定量切出しシャッター装置を備えることにより、簡単な機構で小量の粉体樹脂であっても正確に計量することができ、かつ間欠的に高速で行うことができる。その結果、滑落性が乏しくなる粒径の小さい粉体の適用も可能である。
　また、加熱ガスを熱風とすることによって、火炎を使用しないで溶射することができ、対象物や被覆樹脂自体の熱的影響を緩和することができる。 The coating apparatus of the present invention has a simple structure and can be reduced in size, can be easily and inexpensively incorporated into a normal production line, and even if the sprayed area is a small area, a small amount of powder The resin can be sprayed accurately and intermittently, and the material used can be reduced.
In addition, the coating apparatus of the present invention includes a quantitative cut-out shutter device, so that even a small amount of powder resin can be accurately measured with a simple mechanism and can be intermittently performed at high speed. . As a result, it is also possible to apply a powder having a small particle size that makes sliding property poor.
In addition, by using hot air as the heated gas, thermal spraying can be performed without using a flame, and the thermal influence of the object and the coating resin itself can be mitigated.
本発明の実施形態に係る紙成形容器の斜視図及び部分断面図である。It is the perspective view and partial sectional view of the paper molding container which concern on embodiment of this invention. 本発明の他の実施形態に係る紙成形容器の斜視図である。It is a perspective view of the paper molding container which concerns on other embodiment of this invention. 本発明の実施形態に係る被覆装置の要部及び被覆方法を示す模式図である。It is a schematic diagram which shows the principal part and coating method of the coating device which concerns on embodiment of this invention. 図３に示す装置において、計量室に粉体を圧縮充填する際の模式図である。FIG. 4 is a schematic diagram when the powder shown in FIG. 3 is compressed and filled into a measuring chamber. 本発明の実施例１のラミネート原紙への樹脂盛りをした写真である。It is the photograph which put the resin on the lamination base paper of Example 1 of this invention. 本発明の実施例２の段差部への樹脂盛りをした段差部の断面及び上面の写真である。It is the photograph of the cross section of the level | step-difference part which piled up the resin to the level | step-difference part of Example 2 of this invention, and an upper surface. 本発明の実施形態に係る被覆方法の予備加熱工程及び溶射工程を示す。The preheating process and thermal spraying process of the coating method which concerns on embodiment of this invention are shown.
　　１　コップ状容器
　　２　胴部
　　３　開口カール部
　　４　段差部
　　５　胴部貼り合わせ部
　　６　紙端縁
　　７　環状脚部
　　８，９，１３　樹脂盛り
　１０　絞り成形容器
　１２　フランジ面
　１４　皺
　２５　予備加熱ノズル
　３０　被覆装置
　３１　タンク
　３２　溶射ノズル
　３３　下端開口部
　３４　粉体供給装置
　３５　定量切り出しシャッター装置
　３６　回転体
　３７　計量室
　３８　ガス供給口
　４０　熱風発生器
　４２　流路
　４３　供給管路
　４４　電磁バルブ
　４５　導入流路
　４６　噴射流路
　５２　折返し片
　５７　底板
　５８　環状屈曲部
　６０　無機物混合樹脂層
　７０　試作ラミネート原紙
　７１　樹脂盛り DESCRIPTION OF SYMBOLS 1 Cup-shaped container 2 trunk | drum 3 opening curl part 4 level | step difference part 5 trunk | drum bonding part 6 paper edge 7 cyclic | annular leg part 8, 9, 13 resin pile 10 draw forming container 12 flange surface 14 ２５ 25 preheating nozzle 30 covering Device 31 Tank 32 Spray nozzle 33 Lower end opening 34 Powder supply device 35 Fixed quantity cutout shutter device 36 Rotating body 37 Measuring chamber 38 Gas supply port 40 Hot air generator 42 Flow channel 43 Supply pipe 44 Electromagnetic valve 45 Introductory flow channel 46 Injection Flow path 52 Folded piece 57 Bottom plate 58 Annular bent portion 60 Inorganic mixed resin layer 70 Prototype laminate base paper 71 Resin pile
　以下、本発明に係る紙成形容器の実施形態を図面を基に詳細に説明する。
　図１は、本発明の実施形態に係る紙成形体としてのコップ状容器を示す。該コップ状容器１は、胴部２となる扇形状のブランクの両端縁を貼り合わせて接着して円錐状に成形し、その上端部をカール成形して開口端部とし、下端部Ｂの段面を図１（ｄ）に示すように内側に折り返して折り返し片５２を形成し、その間に断面コ字状に絞り成形した底板５７の環状屈曲部５８を圧着した環状脚部７となっており、開口カール部３のＡ部には図１（ｂ）に拡大して示すようにブランク両端縁の貼り合わせによる段差部４ができている。また、胴部には貼り合わせ部５ができ、該貼り合わせ部の両端縁には紙端がコップ内側及び外側で露出している。以上の構造は、従来周知のコップ状紙成形容器と同様である。 Hereinafter, embodiments of a paper molding container according to the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a cup-shaped container as a paper molded body according to an embodiment of the present invention. The cup-shaped container 1 is formed by concatenating and bonding both end edges of a fan-shaped blank serving as the body portion 2 into a conical shape, curling the upper end portion thereof to form an open end portion, and forming a lower end B step. As shown in FIG. 1 (d), the surface is folded inward to form a folded piece 52, and an annular leg portion 7 is formed by crimping an annular bent portion 58 of a bottom plate 57 drawn into a U-shaped cross section therebetween. As shown in the enlarged view of FIG. 1 (b), a stepped portion 4 is formed by pasting both ends of the blank. Further, a bonding portion 5 is formed on the body portion, and paper edges are exposed at both ends of the bonding portion on the inner side and the outer side of the cup. The above structure is the same as that of a conventionally known cup-shaped paper molding container.
　このようなコップ状紙成形容器において、前述した開口部周縁の開口カール部３における段差部４による密封不良及び直飲容器としての口当たり不良を解消するために、本発明においては、段差部に少量の合成樹脂を溶射して樹脂盛り８を行って、段差を樹脂によって埋めるようにした。
　コップ状紙成形容器のカール部の段差部４という狭い領域に的確に樹脂盛りをすることは困難であるが、本実施形態では、図３に模式的に示す樹脂溶射装置により、粉体樹脂を間欠的に溶射することにより、カール部の段差部４に良好に樹脂盛りをすることができ、上記問題点を原紙端縁自体を特別な加工を施すことなく、簡単な方法により解決することができた。 In such a cup-shaped paper molding container, in order to eliminate the above-mentioned poor sealing due to the stepped portion 4 in the opening curled portion 3 at the periphery of the opening and the mouthfeel as a direct drinking container, The synthetic resin was thermally sprayed to perform resin filling 8 so that the step was filled with resin.
Although it is difficult to accurately deposit the resin in a narrow region called the stepped portion 4 of the curled portion of the cup-shaped paper molding container, in this embodiment, the resin resin spraying apparatus schematically shown in FIG. By spraying intermittently, the stepped portion 4 of the curled portion can be satisfactorily filled with resin, and the above problems can be solved by a simple method without special processing of the edge of the base paper itself. did it.
　また、本実施形態では、図１（ｃ）に拡大して示すように、紙成形容器の胴部貼り合わせ部５の特にコップ内面側の紙端縁６に沿って上下方向に連続した樹脂盛り９を行って、内面側に露出している紙端縁６を樹脂被覆した。それにより、紙端縁６が内容液に直接接触することがなくなり、容器の耐湿性を向上させることができた。なお、本実施形態では貼り合わせ部の内側紙端縁のみを樹脂被覆したが、外側も同様に樹脂被覆することが望ましい。 Further, in this embodiment, as shown in an enlarged view in FIG. 1 (c), a resin pile that is continuous in the vertical direction along the paper edge 6 on the inner surface side of the cup portion of the body bonding portion 5 of the paper molding container. 9 was performed, and the paper edge 6 exposed on the inner surface side was coated with resin. As a result, the paper edge 6 is not in direct contact with the content liquid, and the moisture resistance of the container can be improved. In the present embodiment, only the inner paper edge of the bonded portion is resin-coated, but it is desirable that the outer side be similarly resin-coated.
　このような紙成形容器は、電子レンジ加熱対応容器として、胴部ブランク材及び底部材とも紙を主体とするが、内面及び外面を液状内容物から保護するためにポリオレフィン樹脂やポリエステル樹脂等がラミネートあるいはコーティングされ、または含浸させた複合紙材、あるいは必要に応じてガスバリア層を内層に有する複合層からなる材料が採用でき、電子レンジ加熱ができる材料であれば、その材質は特に限定されない。 Such a paper molding container is a microwave heating container, and the body blank and the bottom member are mainly made of paper, but a polyolefin resin or a polyester resin is laminated to protect the inner and outer surfaces from liquid contents. Alternatively, a composite paper material coated or impregnated, or a material composed of a composite layer having a gas barrier layer as an inner layer as required can be employed, and the material is not particularly limited as long as it can be heated in a microwave oven.
　以上のようなコップ状容器において、本実施形態では、電子レンジ加熱時に焦げが発生しやすい環状脚部７内周面の全周に図１（d）に示すように焦げ防止物質を含有する樹脂被覆層６０を形成し、電子レンジ加熱時に焦げの発生を防止するようにした。該樹脂被覆層は、本実施形態では粒径３０～３００μｍの合成樹脂粉末と焦げ防止物質の粉末を混合した粉体を溶射して、環状脚部７内周面に樹脂被覆層６０を形成した。 In the cup-shaped container as described above, in the present embodiment, a resin containing a non-burning substance as shown in FIG. 1 (d) on the entire inner peripheral surface of the annular leg 7 that is likely to be burned when heated in a microwave oven. The coating layer 60 was formed so as to prevent the occurrence of scorching during microwave heating. In this embodiment, the resin coating layer is formed by spraying a powder obtained by mixing a synthetic resin powder having a particle size of 30 to 300 μm and a non-burning substance powder to form the resin coating layer 60 on the inner peripheral surface of the annular leg 7. .
　本発明に使用される粉末としては、以下に限定されないが、紙を主体とする紙成形容器に対して易接着性を有する材料を用いる。一般的な紙成形容器は、下地である紙基材に樹脂がコートされており、表面樹脂層と同種の樹脂、又は、表面樹脂層よりも融点の低い樹脂を用いることが易接着性の点で好ましい。
　ここで、合成樹脂としては、熱可塑性樹脂であれば特に限定されないが、高－中－低密度ポリエチレン、ポリプロピレン等のポリオレフィン、ＰＥＴ、ＰＥＮ、ＰＬＡ、ＰＢＴ等のポリエステル樹脂の一種または複数種の樹脂粉末が採用できる。また、焦げ防止粉末物質としては、比誘電率の低い物質として、例えば炭酸カルシウム、タルク等が採用できる。これにより、環状脚部でのマイクロ波の吸収による発熱が減少し、焦げの発生を防止できる。 Although not limited to the following as a powder used for this invention, the material which has easy-adhesion with respect to the paper molding container which has paper as a main component is used. In general paper-molded containers, the base paper substrate is coated with a resin, and it is easy to use a resin of the same type as the surface resin layer or a resin having a lower melting point than the surface resin layer. Is preferable.
Here, the synthetic resin is not particularly limited as long as it is a thermoplastic resin, but is a polyolefin such as high-medium-low density polyethylene and polypropylene, or one or more kinds of polyester resins such as PET, PEN, PLA and PBT. Powder can be used. In addition, as the non-burning powder material, for example, calcium carbonate, talc or the like can be adopted as a material having a low relative dielectric constant. As a result, heat generation due to absorption of microwaves in the annular leg portion is reduced, and the occurrence of scorching can be prevented.
　上記の局所領域に焦げ防止物質を含有する樹脂被覆層の形成は、ホットメルト、ホットランナー、あるいはフレーム溶射等による方法が考えられる。しかし、本実施形態のように塗布領域がきわめて狭く且つ少量の樹脂で容器の高速製造ラインで形成するには、前記のいずれの方法でも塗布樹脂の糸引き現象が生じるため、サイクルアップに制限を受けると共に正確な塗布が難しい。それを克服するために、本実施形態では、製造ラインにおいて成形されて搬送されるコップ状形容器に後加工工程として、予備加熱工程と樹脂溶射工程を設け、予備加熱工程で樹脂塗布領域に熱風を吹き付けて環状脚部内周面を被覆樹脂の融点近傍まで予備加熱し、次いで樹脂溶射工程で該部に前記樹脂粉体を溶射した。樹脂粉体の溶射は、前記したように粒径３０～３００μｍの合成樹脂粉末と焦げ防止物質の粉末を混合した粉体樹脂粉末を原材料とし、該原材料を樹脂の溶融温度以下に加熱した加圧加熱ガス（本実施形態では熱風）で、噴射ノズルにより環状脚部内周面に間欠的又は連続的に溶射して樹脂盛りすることにより形成することができる。
　以上のような方法で環状脚部内周面に樹脂被覆をすることによって、糸引き現象が生じることなく所定の小領域に樹脂被覆を的確にすることができ、使用材料を最小限にすることができる。 The formation of the resin coating layer containing the non-burning substance in the local region may be performed by hot melt, hot runner, flame spraying, or the like. However, as in this embodiment, in order to form a container with a very small coating area and a high-speed production line of a container with a small amount of resin, the stringing phenomenon of the coating resin occurs in any of the above methods, and thus the cycle up is limited. It is difficult to apply accurately. In order to overcome this, in the present embodiment, a pre-heating step and a resin spraying step are provided as post-processing steps on the cup-shaped container that is molded and transported in the production line, and hot air is applied to the resin application region in the pre-heating step. Was sprayed to preheat the inner peripheral surface of the annular leg portion to near the melting point of the coating resin, and then the resin powder was sprayed onto the portion in a resin spraying step. As described above, the thermal spraying of the resin powder is performed by using a powder resin powder obtained by mixing a synthetic resin powder having a particle size of 30 to 300 μm and a non-burning substance powder as a raw material, and heating the raw material to a melting temperature of the resin or lower. It can be formed by thermally spraying the resin material intermittently or continuously on the inner peripheral surface of the annular leg portion with a heating gas (hot air in the present embodiment) by an injection nozzle.
By coating the inner circumferential surface of the annular leg with the above-described method, the resin coating can be accurately applied to a predetermined small area without causing the stringing phenomenon, and the material used can be minimized. it can.
　図２は、本発明の他の実施形態を示し、本実施形態では絞り成形容器１０のフランジ面１２に、絞り成形により生じたフランジ面の皺１４を覆うようにフランジ全周に樹脂盛り１３（図２では樹脂盛りの途中まで行った状態を示している）を行い、蓋材をヒートシール時に該樹脂が融着して皺を埋めて、蓋材が完全に融着して密封性を高めるようにした。 FIG. 2 shows another embodiment of the present invention. In this embodiment, the flange surface 12 of the draw-molded container 10 has a resin pile 13 ( FIG. 2 shows a state where the resin is partway filled), and when the lid material is heat-sealed, the resin is fused to fill the flaws, and the lid material is completely fused to improve the sealing performance. I did it.
　以上のように紙成形容器の局所の狭い領域に少量の樹脂盛りを行うのは樹脂の糸引きがあり、所定の局所のみに短時間に効率よく樹脂盛りすることは困難で樹脂のムダが生じるが、本実施形態では次のような樹脂被覆装置を使用して、粉体樹脂を間欠的に溶射することによって、糸引き現象が生じることなく所定の小領域に樹脂被覆を的確にすることができ、使用材料を最小限にすることができた。 As described above, a small amount of resin piling in a narrow local area of a paper-molded container involves resin stringing, and it is difficult to pour resin only in a predetermined local area in a short time, resulting in resin waste. However, in this embodiment, by using the following resin coating apparatus and spraying the powder resin intermittently, the resin coating can be accurately applied to a predetermined small area without causing the stringing phenomenon. It was possible to minimize the material used.
　以下、上記紙成形容器の局所に少量の樹脂盛りを正確に行うことができる本発明の被覆方法及び被覆装置の実施形態を図３及び図４に基づき詳細に説明する。
　本発明は、対象物の小さい領域に少ない樹脂で、糸引き現象等を生じることなく高速でかつ確実に樹脂被覆を可能にする方法として、本発明では合成樹脂を主体とした粉体を、定量的に切り出し合成樹脂の融点近傍まで加熱して間欠的に、局所領域に繰り返し溶射するようにした。合成樹脂粉体としては、該合成樹脂で被覆する局所の用途・目的に応じて樹脂材料及びその粒径が選択され、例えばコップの開口カール部の段差領域に樹脂盛りのために溶射する場合は、段差部を無くして口当たりを良くし、かつ蓋材とヒートシールして密封性を向上させるために、ポリエチレン等のヒートシール性樹脂粉末を採用する。 Hereinafter, an embodiment of the coating method and coating apparatus of the present invention capable of accurately depositing a small amount of resin locally on the paper molding container will be described in detail with reference to FIGS.
In the present invention, as a method for enabling high-speed and reliable resin coating with a small amount of resin in a small area of an object without causing a stringing phenomenon or the like, in the present invention, a powder mainly composed of a synthetic resin is quantified. The heat was cut to near the melting point of the synthetic resin and intermittently sprayed repeatedly on the local area intermittently. As the synthetic resin powder, the resin material and its particle size are selected according to the local application / purpose covered with the synthetic resin. For example, when spraying in the stepped area of the opening curl portion of the cup for resin deposition In order to improve the sealing performance by eliminating the stepped portion and heat sealing with the lid material, heat sealing resin powder such as polyethylene is employed.
　図３は、粉体樹脂を局所領域に溶射するための本実施形態に係る樹脂被覆装置３０の要部を模式的に示したものであり、ホッパー状のタンク３１の下端開口部３３に定量切り出しシャッター装置３５を介して溶射ノズル３２が設けられている。タンク３１には、該タンクに樹脂を主体とする粉体を供給する粉体供給装置３４が連結されている。また、必要に応じて供給される粉体樹脂を所定温度まで加熱するための加熱手段を設けることもできる。加熱手段としては熱風発生装置４０が好ましい。 FIG. 3 schematically shows a main part of the resin coating apparatus 30 according to the present embodiment for spraying a powder resin to a local region, and is quantitatively cut out at a lower end opening 33 of a hopper-shaped tank 31. A thermal spray nozzle 32 is provided via a shutter device 35. A powder supply device 34 is connected to the tank 31 to supply powder mainly composed of resin to the tank 31. Moreover, a heating means for heating the supplied powder resin to a predetermined temperature can be provided as necessary. As the heating means, the hot air generator 40 is preferable.
　定量切り出しシャッター装置３５は、タンク３１の下端開口部３３を横切る回転体３６からなり、該回転体３６にタンク３１の下端開口部３３に面し、頂部が回転体３６の略中心軸線に至るような円錐状窪みの計量室３７が設けられている。そして、回転体３６の一端は間欠回転駆動手段（図示していない）に連結され、かつ中心軸線に沿って一端が加圧ガス源に接続した流路４２を有し、該流路が計量室３７の頂部に形成した加圧ガス供給口３８に連通している。流路４２にはコンプレッサー等の圧縮空気供給源に連結された供給管路４３が連結され、該供給管路に設けた電磁バルブ４４によって、加圧ガスの計量室３７内への送給タイミングを制御する。回転体３６は間欠的に半回転し、計量室が粉体計量位置と溶射ノズルへの圧送位置に交互に位置するように、制御される。
　溶射ノズル３２には加熱手段として加熱ガスが供給される。加熱ガスとしては、熱風が望ましく、コンプレッサー等の空気供給源に連結された熱風発生器４０により電気的或いはガス燃焼等の加熱手段で所定温度に加熱された加熱ガスとして熱風が溶射ノズルに供給される。 The fixed quantity cut-out shutter device 35 includes a rotating body 36 that traverses the lower end opening 33 of the tank 31, faces the lower end opening 33 of the tank 31 to the rotating body 36, and the top reaches the substantially central axis of the rotating body 36. A conical depression measuring chamber 37 is provided. One end of the rotator 36 is connected to intermittent rotation driving means (not shown), and has a channel 42 having one end connected to a pressurized gas source along the central axis, and the channel is a measuring chamber. It communicates with a pressurized gas supply port 38 formed at the top of 37. A supply pipe 43 connected to a compressed air supply source such as a compressor is connected to the flow path 42, and the supply timing of the pressurized gas into the measuring chamber 37 is controlled by an electromagnetic valve 44 provided in the supply pipe. Control. The rotating body 36 is intermittently half-rotated and controlled so that the measuring chamber is alternately positioned at the powder measuring position and the pressure feeding position to the spray nozzle.
A heating gas is supplied to the thermal spray nozzle 32 as a heating means. The heated gas is preferably hot air, and the hot air is supplied to the thermal spray nozzle as a heated gas heated to a predetermined temperature by heating means such as electric or gas combustion by a hot air generator 40 connected to an air supply source such as a compressor. The
　溶射ノズル３２は、その頂部に回転体３６が溶射位置に回転したときに計量室３７からの粉体樹脂を受け入れる導入流路４５を有し、その下方に所定口径の噴射流路４６が形成されている。噴射流路４６には加熱ガスが供給されており、前記計量室から圧送された粉体に加熱ガスと合流する。当然のことながらタンク３１、定量切り出しシャッター装置３５及び溶射ノズル３２間は、粉体が外部に漏れないように密封状態で回転体３６が回転可能に連結している。 The thermal spray nozzle 32 has an introduction flow channel 45 for receiving the powder resin from the measuring chamber 37 when the rotating body 36 is rotated to the thermal spray position, and an injection flow channel 46 having a predetermined diameter is formed below the thermal spray nozzle 32. ing. A heating gas is supplied to the injection flow path 46, and the heating gas merges with the powder pressure-fed from the measurement chamber. As a matter of course, the rotary body 36 is rotatably connected in a sealed state between the tank 31, the quantitative cutout shutter device 35 and the thermal spray nozzle 32 so that the powder does not leak outside.
　本発明の粉体樹脂の被覆装置は、以上のように構成され、粉体樹脂を対象物の所定領域に次のように溶射して樹脂被覆を行う。
　まず、対象物の樹脂被覆予定領域を予備加熱する。予備加熱は、種々の加熱方法が採用でき特に限定されるものではないが、部分的に簡易でかつ安価な設備で加熱するには図７（ａ）に示すように予備加熱ノズル２５から熱風を吹き付けて行うのが好ましい。また、溶射ノズルからの熱風を利用し、樹脂の噴射を遅延させることで予備加熱することもできる。溶射対象面を予備加熱することによって、溶射ノズルから噴射された樹脂が完全に溶融しなくても対象物面に樹脂が良好に溶着し、間欠的に高速で樹脂被覆を形成できる。 The powder resin coating apparatus of the present invention is configured as described above, and performs resin coating by spraying the powder resin onto a predetermined region of the object as follows.
First, the resin coating planned area | region of a target object is preheated. The preheating is not particularly limited, and various heating methods can be adopted. However, in order to heat with partially simple and inexpensive equipment, hot air is supplied from the preheating nozzle 25 as shown in FIG. It is preferable to spray. Moreover, preheating can also be performed by using hot air from a thermal spray nozzle and delaying resin injection. By preheating the surface to be sprayed, even if the resin sprayed from the spray nozzle is not completely melted, the resin is well welded to the surface of the object, and a resin coating can be intermittently formed at a high speed.
　次いで、予備加熱された対象物の局所領域に粉体樹脂を上記被覆装置で溶射して樹脂被覆を行う。上記装置による粉体樹脂の溶射は、図３（ａ）の状態でタンク３１内に粉体樹脂が供給されており、この状態で定量切出しシャッター装置３５の計量室３７内に計量室の容積分の紛末樹脂が自動的に充填されている。次いで、回転体３６が１８０゜回転することにより、図３(b)に示すように計量室３７は反転して溶射ノズル３２の導入流路４５に面し、同時にバルブ４４が開いて加圧エアが反転した計量室に加圧ガス供給口３８を介して吹き込まれ、計量室内の定量の樹脂粉末が溶射ノズルの噴射流路４６を流れる加熱ガスと合流して対象物の局所領域に溶射される(図３(c))。このように、本実施形態によれば、上記操作を繰り返して少量の粉体樹脂を、例えば対象物が停止している状態で、同一箇所に間欠的に複数回に渡って溶射することによって、ごく狭い範囲にも確実に所定量の樹脂盛りを形成することができる。本発明の方法によれば、少量の樹脂を間欠的に噴射するので、溶射樹脂が部分的に溶融した状態であって対象物表面で溶融して融着することができ、融着不良を起こすことがない。また、形成した樹脂盛りを再加熱することで表面をより滑らかにすることもできる。 Next, the resin coating is performed by spraying a powder resin onto the local area of the preheated object with the above coating apparatus. In the spraying of the powder resin by the above apparatus, the powder resin is supplied into the tank 31 in the state shown in FIG. 3A. The powder resin is automatically filled. Next, as the rotating body 36 rotates by 180 °, the measuring chamber 37 is reversed as shown in FIG. 3B to face the introduction flow path 45 of the thermal spray nozzle 32, and at the same time, the valve 44 is opened and pressurized air is opened. Is injected into the measuring chamber through the pressurized gas supply port 38, and a certain amount of the resin powder in the measuring chamber joins with the heated gas flowing through the spray passage 46 of the spray nozzle and is sprayed onto the local region of the object. (FIG. 3 (c)). Thus, according to the present embodiment, by repeating the above operation and spraying a small amount of powder resin, for example, intermittently multiple times on the same location in a state where the object is stopped, A predetermined amount of resin can be reliably formed even in a very narrow range. According to the method of the present invention, since a small amount of resin is intermittently injected, the sprayed resin is partially melted and can be melted and fused on the surface of the object, resulting in poor fusion. There is nothing. Moreover, the surface can be made smoother by reheating the formed resin pile.
　なお、樹脂粉末の粒径が小さく樹脂粉末の滑落性が悪い場合は、計量室３７内に完全に樹脂が充填されるように、図４（ｂ）に示すようにタンク内に設けられた粉体樹脂供給装置３４のノズル３４－１を計量室直近上部まで伸ばして粉体を圧縮充填するようにする。 If the resin powder has a small particle size and the sliding property of the resin powder is poor, the powder provided in the tank as shown in FIG. 4B so that the resin is completely filled in the measuring chamber 37. The nozzle 34-1 of the body resin supply device 34 is extended to the immediate upper part of the measuring chamber so as to compress and fill the powder.
実施例１：（ラミネート原紙への樹脂盛り）
　図５に示すように試作ラミネート原紙７０（[表]ポリエチレン１８μｍ / 原紙（３００ｇ／ｍ２ ）/[裏]ポリエチレン１８μｍ）の表側に、上記装置を用いて次の条件で粉末樹脂を溶射した。
　粉体樹脂：平均粒径１２０μｍの低密度ポリエチレン粉体
　１回の粉体噴射量：約２０ｍｇ
　溶射ノズルと溶射対象面間の距離：６ｍｍ
　ノズル出口熱風温度：３２０℃
　予備加熱：噴射前遅延１．５ｓ
　その結果、図５のような中央部被覆膜厚１．１ｍｍの樹脂盛り７１を糸引き現象を生じることなく良好に形成することができた。 Example 1: (Resin pile on laminated base paper)
As shown in FIG. 5, powder resin was sprayed on the front side of the prototype laminated base paper 70 ([front] polyethylene 18 μm / base paper (300 g / m 2 ) / [back] polyethylene 18 μm) under the following conditions using the above apparatus.
Powder resin: Low-density polyethylene powder having an average particle size of 120 μm Single powder injection amount: about 20 mg
Distance between thermal spray nozzle and target surface: 6mm
Nozzle outlet hot air temperature: 320 ° C
Preheating: Delay before injection 1.5s
As a result, a resin pile 71 having a central coating thickness of 1.1 mm as shown in FIG. 5 could be satisfactorily formed without causing a stringing phenomenon.
実施例２：（段差部への樹脂盛り）
　コップ状容器１の開口カール部３の段差部４近傍に前記装置により次の条件で樹脂を溶射した。
　粉体樹脂：平均粒径１２０μｍの低密度ポリエチレン粉体
　１回の粉体噴射量：約２５ｍｇ
　溶射ノズルと溶射対象面間の距離：１０ｍｍ
　ノズル出口熱風温度：３２０℃
　予備加熱：噴射前遅延１．５ｓ
　備考：熱風発生器による再加熱を実施
　その結果、図６(b－１)に示すように段差部４を覆うように被覆膜厚０．３ｍｍの樹脂盛り８を良好に形成することができた。
　このように、段差部に樹脂盛りをすることによって、蓋材をヒートシールする際に該樹脂が溶融しカール部を圧潰しなくても蓋材との溶着性がより高まり、密封性が向上すると共に直飲時の違和感をなくすことができた。また、オーバーキャップの場合も、カール部の段差部がなくなるため、そこからの洩れを防止できる。 Example 2: (resin pile on a step part)
Resin was sprayed in the vicinity of the stepped portion 4 of the opening curled portion 3 of the cup-shaped container 1 by the above apparatus under the following conditions.
Powder resin: Low-density polyethylene powder having an average particle size of 120 μm Single powder injection amount: about 25 mg
Distance between spray nozzle and spray target surface: 10mm
Nozzle outlet hot air temperature: 320 ° C
Preheating: Delay before injection 1.5s
Remarks: Reheating with hot air generator As a result, as shown in FIG. 6 (b-1), a resin pile 8 having a coating thickness of 0.3 mm can be satisfactorily formed so as to cover the stepped portion 4. It was.
In this way, by depositing the resin on the stepped portion, the resin melts when the lid material is heat-sealed, so that the weldability with the lid material is further increased without crushing the curled portion, and the sealing performance is improved. And I was able to eliminate the uncomfortable feeling when drinking directly. Also, in the case of an overcap, the stepped portion of the curled portion is eliminated, so that leakage from the curled portion can be prevented.
実施例３:(対象物の局所改質を目的する樹脂被覆)
　コップ状容器の環状脚部内周面に全周にわたって以下の条件で樹脂被覆を行った。
　供試容器：コップ状容器（材質：胴部及び底部とも同じ）
　材質層構成：
　　胴部：(内)ポリエチレン（２０μｍ）//スラッシュスラッシュ紙（２５０ｇ／ｍ２）
　　底部：(内）ポリエチレン（４０μｍ）//紙２５０ｇ/ｍ２//ポリエチレン(１５μｍ)
　満杯内容量：５６５ｍｌ、環状脚部高さ：１０ｍｍ
　溶射条件：
　　粉体樹脂：平均粒径１２０μｍの粉体ポリエチレン
　　焦げ防止物質（低誘電率材料）：炭酸カルシウム
　樹脂塗膜：環状脚部内周全周に沿って幅約１０ｍｍ、被膜厚さ１ｍｍ以下
　以上のようにして環状脚部内周面に焦げ防止物質を含有する樹脂被覆層を形成した。コップ状容器の焦げの発生状況を確認するために、次のような試験を行った。
　容器充填内容物：水３３０ｍｌ
　電子レンジ出力：５００Ｗ
　加熱時間：６ｍｉｎ
　上記加熱条件は、内容物（うどん食品）を食するのに最適な通常の加熱温度である。
　焦げの発生状況：被覆層を形成した本実施例の容器の方が糸底部に発生した焦げの色が、比較例として被覆層を設けていない容器よりも薄く範囲が狭かった。 Example 3: (Resin coating for the purpose of local modification of an object)
Resin coating was performed on the inner peripheral surface of the annular leg portion of the cup-shaped container over the entire circumference under the following conditions.
Test container: cup-shaped container (material: same for trunk and bottom)
Material layer structure:
Body: (Inner) Polyethylene (20μm) // Slash slash paper (250g / m 2 )
Bottom: (inside) polyethylene (40 μm) // paper 250 g / m 2 // polyethylene (15 μm)
Full capacity: 565 ml, annular leg height: 10 mm
Thermal spraying conditions:
Powder resin: Powdered polyethylene with an average particle size of 120 μm Anti-burning substance (low dielectric constant material): Calcium carbonate Resin coating film: Width of about 10 mm along the inner circumference of the annular leg portion, film thickness of 1 mm or less A resin coating layer containing an anti-burning substance was formed on the inner circumferential surface of the annular leg. In order to confirm the occurrence of scorching of the cup-shaped container, the following test was conducted.
Container filling contents: 330 ml of water
Microwave oven output: 500W
Heating time: 6 min
The said heating conditions are the normal heating temperature optimal for eating the contents (Udon food).
Situation of scoring: The container of the present example in which the coating layer was formed was thinner in the color of the scoring color generated at the bottom of the yarn than the container without the coating layer as a comparative example.
　以上、本発明の電子レンジ対応の紙成形容器の実施形態及び実施例を説明したが、本発明はこれらのものに限るものでなく、紙成形容器としては必ずしも環状脚部を有するカップ形状の容器に限るものでなく、電子レンジ対応の紙成形容器の焦げが発生しやすい部位を有する種々の構造のものに適用可能である。 As mentioned above, although embodiment and the Example of the paper-molding container corresponding to a microwave oven of this invention were described, this invention is not restricted to these, As a paper-molding container, the cup-shaped container which necessarily has an annular leg part. The present invention is not limited to this, and the present invention can be applied to a variety of structures having a portion that is likely to cause scoring of a microwave-compatible paper-molded container.
　本発明は、紙成形容器における狭い局所領域に確実にかつ効率よく樹脂盛りをすることができ、簡単な構成で紙成形容器の密封性や電子レンジ対応の焦げ発生の問題点を解決でき、安価な構成で紙成形容器の常温流通への適用可能性を高めることができ、また、局所領域に被覆樹脂を確実に溶射することができ、産業上の利用可能性が高い。 The present invention can reliably and efficiently deposit a resin in a narrow local area in a paper molding container, and can solve the problems of the sealing property of the paper molding container and the occurrence of scorching for a microwave oven, and is inexpensive. With a simple structure, the applicability of the paper-molded container to normal temperature distribution can be increased, and the coating resin can be reliably sprayed on the local region, and the industrial applicability is high.

Claims (14)

  1. 　開口部を有する紙成形体において、局所部に合成樹脂を主体とする粉体からなる被覆材料の溶射による樹脂盛りがなされていることを特徴とする紙成形体。 A paper molded body having an opening, wherein the resin molding is formed by thermal spraying of a coating material made of powder mainly composed of synthetic resin in a local portion.
  2. 　前記局所部がコップ状紙成形体の開口部周縁のすくなくとも貼り合わせ段差部であり、前記樹脂盛りによって前記段差部を埋めていることを特徴とする請求項１に記載の紙成形体。 2. The paper molded body according to claim 1, wherein the local portion is at least a bonding step portion at the periphery of the opening of the cup-shaped paper molded body, and the step portion is filled with the resin pile.
  3. 　前記局所部が紙成形体の胴部の貼り合わせ段差部であり、前記樹脂盛りによって、前記貼り合わせ部の紙端縁を被覆していることを特徴とする請求項１に記載の紙成形体。 2. The paper molded body according to claim 1, wherein the local portion is a bonding stepped portion of a body portion of the paper molded body, and the resin edge covers a paper edge of the bonding portion. .
  4. 　前記紙成形体が紙を主体とする絞り成形体であり、前記局所部が開口フランジ面全周であり、前記樹脂盛りによって該開口フランジ面のしわを被覆しているものであることを特徴とする請求項１に記載の紙成形体。 The paper molded body is a drawn molded body mainly made of paper, the local portion is the entire circumference of the opening flange surface, and the wrinkles of the opening flange surface are covered with the resin piling. The paper molded body according to claim 1.
  5. 　前記樹脂盛りが、熱接着性樹脂の粉末を溶射して形成された平均被膜厚さ０．３ｍｍ以下である請求項１に記載の紙成形体。 The paper molded body according to claim 1, wherein the resin pile has an average film thickness of 0.3 mm or less formed by thermal spraying a powder of a heat-adhesive resin.
  6. 　前記紙成形体が電子レンジ加熱対応の紙成形容器であって、該紙成形容器の局所領域に焦げ防止物質を含有する樹脂被覆層を形成してなることを特徴とする請求項１に記載の紙成形体。 The said paper molded object is a paper molding container corresponding to a microwave oven heating, Comprising: The resin coating layer containing a non-burning substance is formed in the local area | region of this paper molding container. Paper molded body.
  7. 　前記樹脂被覆層は、樹脂粉末に焦げ防止物質粉末を混合した粉体を溶射して形成したものである請求項６に記載の紙成形体。 The paper molded body according to claim 6, wherein the resin coating layer is formed by spraying a powder obtained by mixing a non-burning substance powder with a resin powder.
  8. 　前記焦げ防止物質粉末が比誘電率２以下の無機物である請求項７に記載の紙成形体。 The paper molded body according to claim 7, wherein the non-burning substance powder is an inorganic substance having a relative dielectric constant of 2 or less.
  9. 　対象物の局所領域を合成樹脂を主体とする被覆材料で被覆する被覆方法であって、前記被覆材料が合成樹脂を主体とした粉体であり、該粉体を間欠的に前記局所領域に溶射することを特徴とする被覆方法。 A coating method for coating a local region of an object with a coating material mainly composed of a synthetic resin, wherein the coating material is a powder mainly composed of a synthetic resin, and the powder is intermittently sprayed on the local region. A coating method characterized by:
  10. 　前記溶射は、前記粉体を定量に切り出し加圧ガスにより圧送し加熱ガスに合流させて間欠的に前記局所領域に溶射する請求項９に記載の被覆方法。 10. The coating method according to claim 9, wherein the thermal spraying is performed by intermittently spraying the powder onto the local region intermittently by cutting the powder into a fixed amount, pumping it with a pressurized gas, and joining the heated gas.
  11. 　前記加熱ガスは熱風であり前記合成樹脂粉体を融点近傍で加熱し部分的に溶融させる請求項１０に記載の被覆方法。 The coating method according to claim 10, wherein the heated gas is hot air, and the synthetic resin powder is heated in the vicinity of a melting point to be partially melted.
  12. 　前記対象物は、被覆する局所領域が予備加熱される請求項９に記載の被覆方法。　 The coating method according to claim 9, wherein the object is preheated in a local region to be coated. *
  13. 　対象物の局所領域を合成樹脂を主体とする被覆材料で被覆する被覆装置であって、前記被覆材料が粉体であり、該粉体が供給されるタンク、該タンクの下端と連通した溶射ノズル、前記タンクの下端開口部と前記溶射ノズルとの間に設けられた定量切り出しシャッター装置とを備えてなり、前記タンクから定量の粉体を前記定量切り出しシャッター装置で切り出して加熱ガスに合流させ、前記溶射ノズルから溶射するようにしてなることを特徴とする被覆装置。 A coating apparatus for coating a local area of an object with a coating material mainly composed of a synthetic resin, wherein the coating material is powder, a tank to which the powder is supplied, and a thermal spray nozzle communicating with a lower end of the tank , Comprising a quantitative cutout shutter device provided between the lower end opening of the tank and the thermal spray nozzle, cut a fixed amount of powder from the tank with the quantitative cutout shutter device, and merged with the heated gas, The coating apparatus is characterized by spraying from the spray nozzle.
  14. 　前記定量切り出しシャッター装置は、前記タンクの出口開口部を横切る回転体からなり、該回転体に前記タンクの出口開口部に面する計量室が設けられると共に、該計量室のガス供給口に連通し該計量室に加圧ガスを供給するバルブを有してなり、前記回転体は、計量位置と溶射位置との間を間欠回転可能であり、計量位置で前記タンクの出口開口部に面して定量の粉体を計量し、噴射位置で前記計量室が前記溶射ノズルに面し、前記バルブから前記計量室に加圧ガスが供給されて前記粉体を前記溶射ノズルに圧送する請求項１３に記載の被覆装置。 The quantitative cut-out shutter device comprises a rotating body that traverses the outlet opening of the tank. The rotating body is provided with a measuring chamber facing the outlet opening of the tank, and communicates with a gas supply port of the measuring chamber. A valve for supplying pressurized gas to the metering chamber, the rotating body being capable of intermittent rotation between the metering position and the spraying position, facing the outlet opening of the tank at the metering position; 14. The method according to claim 13, wherein a predetermined amount of powder is measured, the measuring chamber faces the spray nozzle at an injection position, and pressurized gas is supplied from the valve to the measuring chamber to press the powder to the spray nozzle. The coating apparatus as described.
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KR20180021227A (en) 2018-02-28
KR20160148019A (en) 2016-12-23
KR101877275B1 (en) 2018-07-11
CN108284995A (en) 2018-07-17
EP3150502A1 (en) 2017-04-05
US20170191151A1 (en) 2017-07-06
CN106414252A (en) 2017-02-15
KR101894755B1 (en) 2018-09-04
CN106414252B (en) 2019-01-25

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